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Gotcha! I say those pages should be excluded via robots.txt. Build static landing pages for any keyword term you wish to rank for and optimize those. Or rather than build a new page, take the top result of a search for keyword site:yourdomain.com, which will tell you what page already ranks highest for that target phrase, and and use that for your landing page for a term; optimize on page and build internal and external links to the page for the term.